Vimes had been economical with the truth when he promised his wife that he would not take any weapons on holiday with him. However, he’d reasoned that a knuckleduster was not so much a weapon as a way of making certain that he stayed alive. It could be called a defensive instrument, a kind of shield, as it were, especially if you needed to get your defense in before you were attacked.
I'm currently behind on reviews, so don't be surprised if the recent reviews are a bit sparse.